Materials Literature
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The transition-metal alkoxide yttrium 2-methoxyethoxide Y(OEtOMe)(3) in solution is studied as a model system of the large class of alkoxide precursors used in the sol-gel process by means of EXAFS spectroscopy. The discussion is focused on the amplitude reduction factor S (2)(0) and the cumulant expansion method. If…
Control of crystal polymorph and size is very important in many application fields. Herein we demonstrate that Langmuir–Blodgett (LB) films of stearic acid (SA) and octadecylamine (ODA) can serve as templates and generate different polymorphs of glycine crystals. In the neutral aqueous solutions, γ-glycine crystallize…
Organosilane hybrid materials are of interest in the development of diagnostic devices and drug-delivery applications. Here we report a spectroscopic study involving the chemical and structural modification of thiol-functionalised organosilica particles with aminosilane to produce a bifunctional silica hybrid. The ami…
Yttrium-group heavy rare-earth sesquioxide (RE(2)O(3), RE=Y, Dy, Ho, Er) nanobelts were successfully fabricated by thermolysis of solid RE(NO(3))(3)x H(2)O in a dodecylamine/1-octadecene mixed solvent system. The synthetic principle is based on separating the nucleation and growth processes by utilizing the poor solub…
Hydrotalcite, layered double hydroxides (LDH), with hexagonal morphology has been rapidly synthesized by microwave reaction within 1 hour by urea hydrolysis from homogeneous solution. Different synthesis parameters, Mg/Al molar ratio, microwave reaction temperature and microwave power were systematically investigated.…
Correlations between the local diameter and local radial elastic modulus in multiwalled carbon nanotubes (MWNTs) were investigated via ultrasonic force microscopy. Spatial cross-correlation analysis showed that local radial modulus variations were inversely correlated with local diameter gradients ("bamboo" structures…
We present a study of the anisotropic transport properties (electrical resistivity, thermoelectric power, Hall coefficient, and thermal conductivity) of a single-crystalline ${\mathrm{Al}}_{80}{\mathrm{Cr}}_{15}{\mathrm{Fe}}_{5}$ complex metallic alloy that is an excellent approximant to the decagonal quasicrystal wit…
High interfacial strengths of elastomer to metal joints imply the formation of covalent bonds at the interface. It is proposed to deposit a plasma polymer coating containing double bonds on an aluminium substrate for the formation of crosslinks between the elastomer and the coating during peroxide crosslinking of the…
A successful combination of “oxygen-assisted chemical vapor deposition (CVD) process” and Co catalyst nanoparticles to grow highly pure single walled carbon nanotubes (SWNTs) was demonstrated. Recently, it was reported that addition of small amounts of oxygen during CVD process dramatically increased the purity and yi…
The molecular details of the processes involved in divergent evolution of "new" enzymatic functions are ill-defined. Likely starting points are either a progenitor promiscuous for the new reaction or a progenitor capable of catalyzing the new reaction following a single substitution that results from a single base cha…
A new type of organic−inorganic poly(3,4-ethylenedioxythiophene) PEDOT/mesoporous carbon composite was first synthesized by a simple in situ polymerization of 3,4-ethylenedioxythiophene monomer within the mesopores and on the particle surface of CMK-3. The composition, morphology, and structure of the composite were i…
Cellulose and amylose are (1-->4)-linked polysaccharides that are used extensively in the textiles, paper, and food and feed industries and are finding increasing use as alternative fuels and so forth. At the molecular level, cellulose and amylose differ only in their anomeric configuration: beta in cellulose, alpha i…
For the first time, an interpenetrating phase polymer nanocomposite formed by the percolation of multiwalled carbon nanotubes (MWCNTs) in polystyrene (PS) has been quantitatively characterized through electrical conductivity measurements and melt rheology. Both sets of measurements, in conjunction with scanning electr…
We describe a two-dimensional finite element method designed to model the nucleation, growth and evolution of voids in polycrystalline interconnects. Our computations extend earlier models by accounting in detail for the effects of grain boundaries and interfaces in the solid. In particular, the model includes the eff…
Abstract The crystal structure of LiBH 4 (thf) is of the same type as that of LiBH 4 (OEt 2 ) in that it forms double chains containing seven‐coordinate Li atoms and BH 4 groups where one H atom coordinates to three Li atoms. In addition, three H atoms form Li–H–B bridges to three different Li atoms. (NaBH 4 ) 2 (trig…
Red emitting nanophosphors of CaTiO 3:Pr 3+ with various particle sizes were prepared by sol−gel methods and structurally characterized by X-ray diffraction and field emission scanning electron microscopy. The fluorescent and phosphorescent properties of CaTiO 3:Pr 3+ nanoparticles as a function of particle sizes were…
Abstract Graft copolymers of propene with styrene were analyzed with regard to their chemical heterogeneity using both SEC coupled to FT‐IR spectroscopy and CRYSTAF. The SEC‐FTIR indicates chemical homogeneity of the copolymer samples. The decrease in crystallization temperature in CRYSTAF does not correlate with the…
Abstract TriPEGylated functionalized dendritic poly(ethylene imines) were synthesized and their transportation properties for rose Bengal (up to 50 guests per dendrimer) were evaluated. A critical aggregation concentration was observed, demonstrating the formation of aggregates among the dendrimers. The structure‐acti…
Crystals of lithium carbonate (monoclinic C 2/ c ) have been synthesized from aqueous solution at room temperature and pressure. Their observed growth morphology, essentially made by {001}, {1̅01}, and {110} forms, has been compared with the theoretical one calculated applying the Hartman−Perdok method and using a for…
Abstract The preparation of calcium hexaaluminate, CaO · 6Al 2 O 3 , by solution combustion synthesis was achieved. It was shown that calcium nitrate and aluminium nitrate develop an essentially different behaviour with respect to urea or β‐alanine: urea is the most suitable fuel for aluminium nitrate, whereas β‐alani…